Power Supply

Hello, I currently have a 750w Corsair PSU.

My pc specs are:
2 140mm fans
Intel Core i7 Processor with default fan
GTX 580
16 GB ram
2 SSDs
2 HDDs

I am planning on adding a few more case fans, a high performance CPU fan and another GTX 580. I don't plan on overclocking anything and don't want to do water cooling.

Do I need to upgrade my PSU or is 750w enough?

Thanks :ange:
10 answers Last reply
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  1. Here are some power readings for the 580.
    http://www.bit-tech.net/hardware/graphics/2010/11/09/nvidia-geforce-gtx-580-review/8
    That thing can use a lot of power under load and it might not be bad to boost to 850 or 900w.
  2. That 750W PSU with its single +12V rail rated at 60A is more than enough power. Use a PSU calc to prove it to yourself depending upon the added devices in your system: http://www.thermaltake.outervision.com/ or http://www.extreme.outervision.com/psucalculatorlite.jsp
  3. You also need to be more specific with your parts. 16gb ram can mean different things. The i7's can use a large range of power.
    Also I just entered it in to one of those calculators and got 698watts.
    http://www.thermaltake.outervision.com/Power
  4. That calculator is pretty bad, it gets power consumption of my PC at 100% load at 864watts, when real world power consumption is only is nearly 200watts lower (measure by wall socket meter)
  5. it is measuring it under load. That means if every components is under load. When a computer is idle power consumption goes to almost nothing.
  6. I linked you to two PSU calculators above so you could compare the results... or average them. Of course, they will only be as accurate as the person entering the data.
  7. kitsunestarwind said:
    That calculator is pretty bad, it gets power consumption of my PC at 100% load at 864watts, when real world power consumption is only is nearly 200watts lower (measure by wall socket meter)

    If you have a Kill-O-Watt between your PC and the electrical outlet, then you can see the amount of power the system is drawing. In fact, it will be somewhat less on the load side of the PSU than on the Line side of the PSU by a factor of about 20% due to power factor loss from inductive and capacitive reactance, etc. So if your meter is showing 200W, your PC is probably only using 160W. (rough estimate)

    Check it when you are stressing your graphics card or CPU. Like when running Prime95 or Furmark.
  8. You think you linked two separate power supply calculators?

    Aren't Thermaltake just using the calculator that Outervision provides?
  9. Silvune said:
    You think you linked two separate power supply calculators?

    Aren't Thermaltake just using the calculator that Outervision provides?

    LOL! You may be right. They do look extremely similar now that I examine them. But, I just plugged the values of my system in and got 755W at Extreme and 750W at Thermaltake. If you're right, I wonder why they aren't the same results? Maybe one had its algorithm updated.
  10. You could just measure it by doing it the old fashioned way. Manually adding them up. If you don't trust one of those you could just use some web searching and a calculator.
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